The Chaperone Bride
When Joanna finds herself destitute after her gambler father's suicide, unable to find work, and is offered instead a marriage of convenience she sees no other option.
Sir Kenelm needs a wife as a chaperone, since governesses are reluctant to live in a widower's household.
The twins, children of his first wife, refuse to accept her as a new Mama. The governess, having thought she too was applying for the position of governess, resents her.